EP 2222566 A1 20100901 - ACTUATOR WITH TRANSFER OF ANGULAR MOMENTUM FOR THE ATTITUDE CONTROL OF A SPACECRAFT
Title (en)
ACTUATOR WITH TRANSFER OF ANGULAR MOMENTUM FOR THE ATTITUDE CONTROL OF A SPACECRAFT
Title (de)
AKTUATOR MIT ÜBERTRAGUNG VON DREHIMPULS ZUR LAGEREGELUNG EINES RAUMSCHIFFS
Title (fr)
ACTIONNEUR A TRANSFERT DE MOMENT CINETIQUE POUR LE CONTROLE D'ATTITUDE D'UN ENGIN SPATIAL
Publication
Application
Priority
- EP 2008065732 W 20081118
- FR 0759224 A 20071122
Abstract (en)
[origin: WO2009065818A1] An actuator for the attitude control of a spacecraft comprises a first flywheel (1) rotated by a motor (5) and a second flywheel (2). The two flywheels (1, 2) are rotationally moveable about an axis (61) and are mechanically coupled by mechanical coupling means (4) imposing between a rate of rotation ?1 of the first flywheel (1) and a rate of rotation ?2 of the second flywheel (2) a ratio R = ?2 / ?1 which is negative on the one hand and continuously modifiable by the coupling means (4) in response to a command on the other hand so as to modify the total angular momentum of the actuator with constant total kinetic energy of the wheels. In one embodiment, the two flywheels have the same inertia and are coupled by means of a toroidal variator whose ratio R varies between -3 and -1/3. In order to store and retrieve energy at constant angular momentum, the motor (5) drives the flywheels (1, 2) in rotation and operates as a generator so as to brake said flywheels.
IPC 8 full level
B64G 1/28 (2006.01); F16H 15/38 (2006.01)
CPC (source: EP US)
B64G 1/28 (2013.01 - EP US); B64G 1/283 (2013.01 - EP US); B64G 1/286 (2013.01 - EP US); B64G 1/285 (2013.01 - EP US)
Citation (search report)
See references of WO 2009065818A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
WO 2009065818 A1 20090528; EP 2222566 A1 20100901; FR 2924095 A1 20090529; FR 2924095 B1 20100212; US 2010314499 A1 20101216; US 9180983 B2 20151110
DOCDB simple family (application)
EP 2008065732 W 20081118; EP 08851272 A 20081118; FR 0759224 A 20071122; US 74417408 A 20081118